紫外光殺菌空氣清淨裝置之研製

Development of an UVGI Air-cleaning Device

陳宥懿(Yu-Yi Chen) ； 黃振康(Chen-Kang Huang)

《台灣農學會報》 12卷6期 (2011/12) Pp. 533-548

https://doi.org/10.6730/JAAT.201112_12(6).0003

摘要

空氣中的病菌為常見的致病源，容易對人體、動植物產生有害的影響。故本研究為改善空氣品質，利用紫外線照射殺菌方法（ultraviolet germicidal irradiation，UVGI），設計有別以往的空氣清淨機；藉由旋風分離筒（cyclone separator）倒置錐體的設計，使氣流有足夠的時間旋繞腔體內。並在旋風筒內加裝波長253.7 nm 的紫外線殺菌燈管（ultraviolet germicidal lamp），透過計算流體力學軟體COSMOS FloWorks 模擬，在網格442,788、入口流量60 lpm 且利用16條軌跡線分析時，腔體內氣流的平均滯留時間（residence time）長達6.4秒之久。紫外線強度實驗發現在燈管中央位置，距離端點16.5 cm的位置，強度值最高可達到6.48 mW／cm^2；前後兩端點的強度值約為1.05 mW／cm^2，中間位置的光強度值為端點位置的6倍。空氣清淨裝置於測試系統內測試得到大腸桿菌（Escherichia coli.）濃度可降低1.89 log cfu／ml。

關鍵字

空氣清淨 ； 紫外光殺菌 ； 計算流體力學

並列摘要

The microorganisms in the air may have harmful effects on humans, animals and plants. To improve air quality, the cleaning mechanism of ultraviolate germicidal irradiation (UVGI) was applied to design a novel air-cleaning device. Different from traditional designs, a cyclone separator was used to guide the air whirling inside the chamber. According to the results from a CFD commercial package (COSMOS FloWorks 2008), the residence time was about 6.4 seconds, when the inlet flow rate was [60 lpm] 442,788 meshes was used and 16 trajectories are taken into account. It was also found the central part of the lamp produced a higher intensity,of up to 6.48 mW/cm^2, which is about six times higher than the two ends. The device was proven to capable of lowering the E. Coli. concentration by 1.89 log cfu/ml. The corresponding removal efficiency was about 99%.

並列關鍵字

air cleaning ； ultraviolet germicidal irradiation (UVGI) ； computational fluid dynamics (CFD)